Novel benzene hydrogenation catalyst and preparation and use methods thereof

Abstract

The invention discloses a novel benzene hydrogenation catalyst and a preparation and use method thereof, and belongs to the technical field of catalysts. Aluminum oxide is modified, so that the surface acidity of the carrier is reduced, and the problem that the catalyst is easy to deposit carbon in use is solved; by adding the structural aid, the applicable temperature range of the catalyst is widened, side reactions are reduced, the performance of the catalyst is improved, the thermal stability of the catalyst is enhanced, and the service life of the catalyst is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of catalyst technology, specifically relating to a novel benzene hydrogenation catalyst and its preparation and use methods. Background Technology

[0002] Cyclohexane is an important organic chemical intermediate, widely used in the production of nylon-6 and nylon-66. Currently, over 90% of industrially produced cyclohexane is obtained by hydrogenating benzene. The production technology is relatively mature, and commonly used catalysts include nickel-based, platinum-based, and palladium-based catalysts. Among them, nickel-aluminum catalysts have good activity and relatively low price, and are widely used in industrial plants.

[0003] There are also many patent reports on noble metal catalysts for benzene hydrogenation. For example, CN102600888A discloses a noble metal Ru catalyst for benzene hydrogenation. This catalyst is supplemented with promoters La, Ce, Fe, Zn, and Cu, and the support is a mesoporous molecular sieve MCM-41 modified with one or two of the oxides ZrO2, ZnO, and CuO. CN1457923 discloses a platinum-based catalyst for the hydrogenation of benzene to cyclohexane. The catalyst components have the following weight contents: Pt 0.05-20%, promoters 0.05-30%, and the remainder is the support. The preparation method is an impregnation-wet reduction method. The catalyst has high activity and selectivity for the hydrogenation of benzene to cyclohexane.

[0004] There are many patent reports on Ni-based catalysts for benzene hydrogenation. For example, CN1210759A discloses a method for preparing nickel-based benzene hydrogenation catalysts using the sol-gel method; CN1546230 discloses a method for preparing a mixture of nickel oxide and rare earth oxide benzene hydrogenation catalysts using the co-precipitation method; and CN1082388C discloses a method for preparing low-nickel content benzene hydrogenation catalysts using the sol-gel method.

[0005] Unlike precious metals, which typically have lower loadings, nickel-based catalysts usually require metal contents exceeding 40% to achieve good benzene hydrogenation catalytic activity. Impregnation is a simple and low-cost method, highly effective for preparing catalysts with low metal contents. However, when the metal content exceeds 20%, precursor dissolution becomes difficult. Co-precipitation, a commonly used method for preparing high-content, multi-component catalysts, can achieve highly dispersed and homogeneous catalyst components, which is beneficial for improving catalytic activity and stability.

[0006] In existing technologies, benzene hydrogenation catalysts are mostly inorganic supported catalysts. The inorganic oxide supports are primarily alumina, silica, zirconium oxide, magnesium oxide, zinc oxide, activated carbon, or their composites. The surface acidity of inorganic supports makes it easy for carbon deposits to form on the catalyst surface during the benzene hydrogenation reaction, reducing catalyst activity and shortening catalyst life. To reduce carbon deposition, alkaline inorganic promoters are usually added to the catalyst to lower the surface acidity, but this method cannot completely solve the problem of carbon deposition.

[0007] Benzene hydrogenation is an exothermic reaction, and when heat transfer is disrupted, a "temperature runaway" phenomenon can easily occur. Because nickel-based catalysts have poor thermal stability at high temperatures, NiO particles are prone to agglomeration and sintering. Even with thorough dispersion of the metal components through co-precipitation, some nickel can still form strongly interacting "Ni-O-Al" bonds with the support, dispersing on the support surface as nickel-aluminum spinel. This reduces NiO utilization efficiency, lowers catalyst activity and stability, and affects catalyst lifespan. These factors result in the relatively narrow activity temperature range of nickel-aluminum catalysts currently used in industry.

[0008] Therefore, for the hydrogenation of benzene to cyclohexane, a hydrogenation process has been developed that can overcome the problem of poor catalyst stability caused by easy carbon deposition on the catalyst surface, achieve high activity and complete hydrogenation, and avoid reaction runaway. This has important practical significance for the application of benzene hydrogenation catalysts. Summary of the Invention

[0009] To address the aforementioned technical problems, the present invention aims to provide a novel method for preparing a benzene hydrogenation catalyst. By modifying alumina to reduce the acidity of the support surface, the problem of easy carbon deposition in the catalyst during use is solved. The addition of structural additives broadens the applicable temperature range of the catalyst, reduces the occurrence of side reactions, improves the catalyst performance, enhances the thermal stability of the catalyst, and extends the service life of the catalyst.

[0010] This invention is achieved through the following technical solution:

[0011] A novel benzene hydrogenation catalyst, wherein the catalyst is composed of the following components in mass fractions:

[0012] The main active component is 50-65 wt%, alumina is 30-50 wt%, structural auxiliary metal is 0.2-2 wt%, and modifying auxiliary is 0.2-3 wt%.

[0013] The main active component is nickel oxide;

[0014] The structural additive metal is at least one of La, Ce, and Y;

[0015] The modified additive is a mixture of modified additive metals and their oxides with cellulose derivatives in a ratio of 20-25g:120ml;

[0016] The modifying agent metal is at least one selected from Na, Mg, Ti, Zn, Zr, and Ni;

[0017] The cellulose derivative is either sodium carboxymethyl cellulose or sodium carboxyethyl cellulose.

[0018] A novel method for preparing a benzene hydrogenation catalyst includes the following steps:

[0019] S1. Select alumina precursor and modifying agent solution, mix them, crush and sieve them in a mixer to obtain modified alumina powder;

[0020] S2. Select the modified auxiliary metal salt solution and the structural auxiliary metal salt solution and mix them to obtain metal mixture A;

[0021] S3. In the reaction vessel, prepare the precipitant into a solution, stir it evenly, and preheat it to the reaction temperature;

[0022] S4. Under stirring conditions, the metal mixture A is added dropwise to the reaction vessel in S3 at a predetermined rate to carry out a neutralization and precipitation reaction. After the neutralization and precipitation reaction is completed, aging and hot boiling are carried out.

[0023] S5. Then, select modified alumina powder and add it to the heated reaction vessel to mix and slurry. The slurry is then filtered, washed, dried, ground, granulated, calcined and pressed into tablets to obtain the catalyst.

[0024] Preferably, in S1, the alumina precursor is boehmite;

[0025] The mixing and rolling time is 40-60 min, and the mixing and rolling rate is 50-100 rpm;

[0026] The sieving process involves passing the material through a 10-20 mesh filter.

[0027] Preferably, in step S2, the modified auxiliary metal salt solution is a carbonate or nitrate corresponding to the modified auxiliary metal.

[0028] The structural aid metal salt solution is the carbonate or nitrate corresponding to the structural aid metal.

[0029] Preferably, in step S3, the precipitant is sodium carbonate decahydrate;

[0030] The precipitant and deionized water are mixed in a reaction vessel at a ratio of 500-600g:4000mL to form a solution.

[0031] Preferably, in step S4, the dripping time is 60 minutes;

[0032] The predetermined rate is to add the solution slowly at a rate of 20-40 mL / min for the first 15 minutes, and then rapidly at a rate of 40-70 mL / min for the next 45 minutes.

[0033] Preferably, the temperature of the neutralization precipitation reaction is 40–70°C;

[0034] The aging time is 20-60 minutes, and the aging temperature is 40-70℃.

[0035] Preferably, in step S5, the calcination temperature is 350–500°C and the duration is 2–5 hours.

[0036] A method for using a novel benzene hydrogenation catalyst, wherein the catalyst is used in the hydrogenation of pure benzene or materials containing a portion of benzene.

[0037] Compared with the prior art, the present invention has at least the following technical effects:

[0038] This invention provides a novel method for preparing a benzene hydrogenation catalyst. By modifying alumina, the acidity of the support surface is reduced, which solves the problem of easy carbon deposition in the catalyst during use. The addition of structural additives broadens the applicable temperature range of the catalyst, reduces the occurrence of side reactions, improves the catalyst performance, enhances the thermal stability of the catalyst, and extends the service life of the catalyst.

[0039] Among them, (1) an alkaline inorganic additive (i.e. a modifying additive) is added in the preparation of the catalyst support to modify the alumina support, effectively reducing the surface acidity of the alumina support, so that carbon deposits are not easily formed on the surface of the catalyst in the benzene hydrogenation reaction.

[0040] (2) The synergistic effect of the auxiliary metal and the active component nickel broadens the applicable temperature range of the catalyst. The catalyst has high hydrogenation performance in the temperature range of 130-260℃, and the side reactions are effectively suppressed.

[0041] (3) Adding structural aids during the preparation process can fully disperse the active metal nickel. The aid metal can prevent the nickel from forming a strong "Ni-O-Al" bond with the support, effectively inhibiting the agglomeration of NiO particles, preventing catalyst sintering at high temperature, and effectively extending the catalyst life. Detailed Implementation

[0042] The embodiments of the present invention will be described in detail below with reference to the examples. However, those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be regarded as limiting the scope of the present invention. Specific conditions not specified in the examples shall be carried out according to conventional conditions or conditions recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0043] Example 1:

[0044] Weigh 200g of boehmite, 20g of sodium carbonate, 5g of zinc carbonate and 120mL of sodium carboxymethyl cellulose solution with a mass concentration of 5%, mix them evenly and place them in a mixer to grind for 45min. The modified alumina powder is obtained by sieving.

[0045] Weigh out 535g of nickel nitrate hexahydrate, 13.5g of lanthanum nitrate hexahydrate, and 2000mL of deionized water to prepare a metal mixture solution;

[0046] Weigh 530g of sodium carbonate decahydrate and 4000mL of deionized water into a reaction vessel to prepare a solution, stir well, and preheat to the reaction temperature of 55℃.

[0047] Under stirring conditions, molten metal was added dropwise to the reactor for neutralization and precipitation. The rate was controlled at 20 mL / min for the first 15 minutes and 20 mL / min for the next 45 minutes. After neutralization, aging was carried out at 55°C for 30 minutes.

[0048] Weigh 87.5g of modified alumina powder and add it to the reactor to mix and slurry. After slurrying, the material is filtered, washed, dried, ground, and granulated. It is then calcined at 450℃ for 4 hours and pressed into tablets to obtain the catalyst product, which is marked as S-1.

[0049] Example 2:

[0050] Weigh 200g of boehmite, 15g of sodium carbonate, 8g of zirconium nitrate and 120mL of sodium carboxymethyl cellulose solution with a mass concentration of 5%, mix them evenly and place them in a mixer to grind for 50min. The modified alumina powder is obtained by sieving.

[0051] Weigh out 550g of nickel nitrate hexahydrate, 6g of lanthanum nitrate hexahydrate, 5g of cerium nitrate hexahydrate, and 2000mL of deionized water to prepare a metal mixture solution;

[0052] Weigh 542g of sodium carbonate decahydrate and 4000mL of deionized water into a reaction vessel to prepare a solution, stir well, and preheat to the reaction temperature of 60℃.

[0053] Under stirring conditions, molten metal was added dropwise to the reactor for neutralization and precipitation. The rate was controlled at 20 mL / min for the first 15 minutes and at 20 mL / min for the next 45 minutes. After neutralization, aging was carried out at 60°C for 30 minutes.

[0054] Weigh 80g of modified alumina powder and add it to the reactor to mix and slurry. After slurrying, the material is filtered, washed, dried, ground, and granulated. It is then calcined at 450℃ for 4 hours and pressed into tablets to obtain the catalyst product, which is marked as S-2.

[0055] Example 3:

[0056] Weigh 200g of boehmite, 18g of sodium carbonate, 5g of magnesium carbonate and 120mL of sodium carboxyethyl cellulose solution with a mass concentration of 5%, mix them evenly and place them in a mixer to grind for 50min. The mixture is then sieved to obtain modified alumina powder.

[0057] Weigh 600g of nickel nitrate hexahydrate, 3g of lanthanum nitrate hexahydrate, 4g of zirconium nitrate hexahydrate and 2000mL of deionized water to prepare a metal mixture solution;

[0058] Weigh 575g of sodium carbonate decahydrate and 4000mL of deionized water into a reaction vessel to prepare a solution, stir well, and preheat to the reaction temperature of 60℃.

[0059] Under stirring conditions, molten metal was added dropwise to the reactor for neutralization and precipitation. The rate was controlled at 20 mL / min for the first 15 minutes and 20 mL / min for the next 45 minutes. After neutralization, aging was carried out at 60°C for 30 minutes.

[0060] Weigh 75g of modified alumina powder and add it to the reactor to mix and slurry. After slurrying, the material is filtered, washed, dried, ground, and granulated. It is then calcined at 450℃ for 4 hours and pressed into tablets to obtain the catalyst product, which is marked as S-3.

[0061] Example 4:

[0062] Weigh 200g of boehmite, 18g of sodium carbonate, 5g of magnesium carbonate and 120mL of sodium carboxymethyl cellulose solution with a mass concentration of 5%, mix them evenly and place them in a mixer to grind for 50min. Then sieve to obtain modified alumina powder.

[0063] Weigh out 485g of nickel nitrate hexahydrate, 10g of lanthanum nitrate hexahydrate, 8g of zirconium nitrate hexahydrate, and 2000mL of deionized water to prepare a metal mixture solution;

[0064] Weigh 477g of sodium carbonate decahydrate and 4000mL of deionized water into a reaction vessel to prepare a solution, stir well, and preheat to the reaction temperature of 60℃.

[0065] Under stirring conditions, molten metal was added dropwise to the reactor for neutralization and precipitation. The rate was controlled at 20 mL / min for the first 15 minutes and at 20 mL / min for the next 45 minutes. After neutralization, aging was carried out at 60°C for 30 minutes.

[0066] Weigh 100g of modified alumina powder and add it to the reactor to mix and slurry. After slurrying, the material is filtered, washed, dried, ground, and granulated. It is then calcined at 450℃ for 4 hours and pressed into tablets to obtain the catalyst product, which is marked as S-4.

[0067] Example 5:

[0068] Weigh 200g of boehmite, 18g of sodium carbonate, 5g of potassium carbonate and 120mL of 5% sodium carboxymethyl cellulose solution, mix them evenly and place them in a mixer and grind for 50min. Then sieve to obtain modified alumina powder.

[0069] Weigh out 560g of nickel nitrate hexahydrate, 4g of lanthanum nitrate hexahydrate, 6g of zirconium nitrate hexahydrate, and 2000mL of deionized water to prepare a metal mixture solution;

[0070] Weigh 556g of sodium carbonate decahydrate and 4000mL of deionized water into a reaction vessel to prepare a solution, stir well, and preheat to the reaction temperature of 60℃.

[0071] Under stirring conditions, molten metal was added dropwise to the reactor for neutralization and precipitation. The rate was controlled at 20 mL / min for the first 15 minutes and at 20 mL / min for the next 45 minutes. After neutralization, aging was carried out at 60°C for 30 minutes.

[0072] 77g of modified alumina powder was weighed and added to the reactor for mixing and pulping. After filtration, washing, drying, grinding and granulation, the pulp was calcined at 450℃ for 4 hours and then pressed into tablets to obtain the catalyst product, which was marked as S-5.

[0073] Example 6:

[0074] Weigh 200g of boehmite, 20g of sodium carbonate and 120mL of 5% sodium carboxyethyl cellulose solution, mix them evenly and place them in a mixer to grind for 55min. Then sieve to obtain modified alumina powder.

[0075] Weigh 520g of nickel nitrate hexahydrate, 4g of lanthanum nitrate hexahydrate, 6g of zirconium nitrate hexahydrate, and 2000mL of deionized water to prepare a metal mixture solution;

[0076] Weigh 515g of sodium carbonate decahydrate and 4000mL of deionized water into a reaction vessel to prepare a solution, stir well, and preheat to the reaction temperature of 65℃.

[0077] Under stirring conditions, molten metal was added dropwise to the reactor for neutralization and precipitation. The rate was controlled at 20 mL / min for the first 15 minutes and at 20 mL / min for the next 45 minutes. After neutralization, aging was carried out at 60°C for 30 minutes.

[0078] 95g of modified alumina powder was weighed and added to the reactor for mixing and pulping. After filtration, washing, drying, grinding and granulation, the pulp was calcined at 450℃ for 4 hours and then pressed into tablets to obtain the catalyst product, which was marked as S-6.

[0079] Example 7:

[0080] Weigh 200g of boehmite, 18g of sodium carbonate, 5g of zirconium nitrate and 120mL of sodium carboxymethyl cellulose solution with a mass concentration of 5%, mix them evenly and place them in a mixer to grind for 55min. The mixture is then sieved to obtain modified alumina powder.

[0081] Weigh out 525g of nickel nitrate hexahydrate, 4g of lanthanum nitrate hexahydrate, 6g of zirconium nitrate hexahydrate, and 2000mL of deionized water to prepare a metal mixture solution;

[0082] Weigh 517.5g of sodium carbonate decahydrate and 4000mL of deionized water into a reaction vessel to prepare a solution, stir well, and preheat to the reaction temperature of 65℃.

[0083] Under stirring conditions, molten metal was added dropwise to the reactor for neutralization and precipitation. The rate was controlled at 20 mL / min for the first 15 minutes and at 20 mL / min for the next 45 minutes. After neutralization, aging was carried out at 60°C for 30 minutes.

[0084] Weigh 90g of modified alumina powder and add it to the reactor to mix and slurry. After slurrying, the material is filtered, washed, dried, ground, and granulated. It is then calcined at 450℃ for 4 hours and pressed into tablets to obtain the catalyst product, which is marked as S-7.

[0085] Example 8:

[0086] Weigh 200g of boehmite, 18g of sodium carbonate, 5g of magnesium carbonate and 120mL of sodium carboxymethyl cellulose solution with a mass concentration of 5%, mix them evenly and place them in a mixer to grind for 55min. The mixture is then sieved to obtain modified alumina powder.

[0087] Weigh out 535g of nickel nitrate hexahydrate, 6g of lanthanum nitrate hexahydrate, 6g of zirconium nitrate hexahydrate, and 2000mL of deionized water to prepare a metal mixture solution;

[0088] Weigh 530g of sodium carbonate decahydrate and 4000mL of deionized water into a reaction vessel to prepare a solution, stir well, and preheat to the reaction temperature of 65℃.

[0089] Under stirring conditions, molten metal was added dropwise to the reactor for neutralization and precipitation. The rate was controlled at 20 mL / min for the first 15 minutes and at 20 mL / min for the next 45 minutes. After neutralization, aging was carried out at 60°C for 30 minutes.

[0090] Weigh 87.5g of modified alumina powder and add it to the reactor to mix and slurry. After slurrying, the material is filtered, washed, dried, ground, and granulated. It is then calcined at 450℃ for 4 hours and pressed into tablets to obtain the catalyst product, which is marked as S-8.

[0091] Comparative Example 1:

[0092] Compared to Example 1, the alumina modification step is missing; otherwise, they are the same.

[0093] Weigh out 535g of nickel nitrate hexahydrate, 13.5g of lanthanum nitrate hexahydrate, and 2000mL of deionized water to prepare a metal mixture solution;

[0094] Weigh 530g of sodium carbonate decahydrate and 4000mL of deionized water into a reaction vessel to prepare a solution, stir well, and preheat to the reaction temperature of 55℃.

[0095] Under stirring conditions, molten metal was added dropwise to the reactor for neutralization and precipitation. The rate was controlled at 20 mL / min for the first 15 minutes and 20 mL / min for the next 45 minutes. After neutralization, aging was carried out at 55°C for 30 minutes.

[0096] Weigh 87.5g of alumina powder and add it to the reactor to mix and slurry. After slurrying, the material is filtered, washed, dried, ground, and granulated. It is then calcined at 450℃ for 4 hours and pressed into tablets to obtain the catalyst product, which is labeled D-1.

[0097] Comparative Example 2:

[0098] Compared to Example 1, the addition of the performance (structural) auxiliary lanthanum nitrate is absent; otherwise, they are the same.

[0099] Weigh 200g of boehmite, 20g of sodium carbonate, 5g of zinc carbonate and 120mL of sodium carboxymethyl cellulose solution with a mass concentration of 5%, mix them evenly and place them in a mixer to grind for 45min. The modified alumina powder is obtained by sieving.

[0100] Weigh 535g of nickel nitrate hexahydrate and 2000mL of deionized water to prepare a metal mixture; weigh 530g of sodium carbonate decahydrate and 4000mL of deionized water to prepare a solution in a reaction vessel, stir evenly, and preheat to the reaction temperature of 55℃.

[0101] Under stirring conditions, molten metal was added dropwise to the reactor for neutralization and precipitation. The rate was controlled at 20 mL / min for the first 15 minutes and 20 mL / min for the next 45 minutes. After neutralization, aging was carried out at 55°C for 30 minutes.

[0102] Weigh 87.5 modified alumina powder and add it to the reactor to mix and slurry. After slurrying, the material is filtered, washed, dried, ground, and granulated. It is then calcined at 450℃ for 4 hours and pressed into tablets to obtain the catalyst product, which is marked D-2.

[0103] The performance of the catalyst samples in the above embodiments and comparative examples was evaluated under simulated industrial plant operating conditions: original catalyst particle size, fixed-bed reactor.

[0104] Catalyst reduction: The reducing gas is high-purity hydrogen, the reduction pressure is atmospheric pressure, the reduction temperature is 400℃, the reduction space velocity is 400-500h-1, and the reduction time is 2h.

[0105] Catalyst evaluation: pressure 0.6 MPa, temperature 130-260℃, liquid benzene air volume 1.0 h⁻¹, hydrogen / benzene (molar) ratio 6.0.

[0106] The catalyst samples from the examples and comparative examples are shown in Tables 1, 2, and 3 below.

[0107] Table 1. Conversion rate data (%) of catalyst samples at different temperatures

[0108] 130℃ 150℃ 170℃ 190℃ 210℃ 240℃ 260℃ S-1 100 100 100 100 100 100 99.9 S-2 100 100 100 100 100 99.9 99.8 S-3 100 100 100 100 100 99.9 99.8 S-4 100 100 100 100 99.9 99.8 99.8 S-5 100 100 100 100 99.9 99.8 99.8 S-6 100 100 100 100 100 99.9 99.9 S-7 100 100 100 100 99.9 99.9 99.8 S-8 100 100 100 100 99.9 99.8 99.8 D-1 100 100 99.9 99.8 99.6 99.3 99.2 D-2 100 99.9 99.9 99.7 99.5 99.4 99.3

[0109] Table 2. Selectivity data (%) of catalyst samples at different temperatures

[0110]

[0111]

[0112] Table 3. Description of catalyst usage after use

[0113] catalyst sample Description of carbon buildup after use S-1 The catalyst particles remained intact after use, with no carbon buildup. S-2 The catalyst particles remained intact after use, with no carbon buildup. S-3 The catalyst particles remained intact after use, with no carbon buildup. S-4 The catalyst particles remained intact after use, with no carbon buildup. S-5 The catalyst particles remained intact after use, with no carbon buildup. S-6 The catalyst particles remained intact after use, with no carbon buildup. S-7 The catalyst particles remained intact after use, with no carbon buildup. S-8 The catalyst particles remained intact after use, with no carbon buildup. D-1 The catalyst particles remained intact after use, with slight carbon buildup. D-2 The catalyst particles remained intact after use, with noticeable carbon buildup.

[0114] As can be seen from the data in Tables 1, 2 and 3, the catalyst composition and preparation method using this technical solution have a wider applicable temperature range, better thermal stability, and especially stronger selectivity.

[0115] The catalyst composition and preparation method using this technical solution result in intact catalyst particles after use, without any carbon buildup.

[0116] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A novel benzene hydrogenation catalyst, characterized in that, The catalyst is composed of the following components by mass fraction: The main active component is 50-65 wt%, alumina is 30-50 wt%, structural auxiliary metal is 0.2-2 wt%, and modifying auxiliary is 0.2-3 wt%. The main active component is nickel oxide; The structural additive metal is at least one of La, Ce, and Y; The modified additive is a mixture of modified additive metals and their oxides with cellulose derivatives in a ratio of 20-25g:120ml; The modifying agent metal is at least one selected from Na, Mg, Ti, Zn, Zr, and Ni; The cellulose derivative is either sodium carboxymethyl cellulose or sodium carboxyethyl cellulose.

2. A method for preparing the novel benzene hydrogenation catalyst as described in claim 1, characterized in that, Includes the following steps: S1. Select alumina precursor and modifying agent solution, mix them, crush and sieve them in a mixer to obtain modified alumina powder; S2. Select the modified auxiliary metal salt solution and the structural auxiliary metal salt solution and mix them to obtain metal mixture A; S3. In the reaction vessel, prepare the precipitant into a solution, stir it evenly, and preheat it to the reaction temperature; S4. Under stirring conditions, the metal mixture A is added dropwise to the reaction vessel in S3 at a predetermined rate to carry out a neutralization and precipitation reaction. After the neutralization and precipitation reaction is completed, aging is carried out. S5. Then, select modified alumina powder and add it to the heated reaction vessel to mix and slurry. The slurry is then filtered, washed, dried, ground, granulated, calcined and pressed into tablets to obtain the catalyst.

3. The method for preparing a novel benzene hydrogenation catalyst according to claim 2, characterized in that, In S1, the alumina precursor is boehmite; The mixing and rolling time is 40-60 min, and the mixing and rolling rate is 50-100 rpm; The sieving process involves passing the material through a 10-20 mesh filter.

4. The method for preparing a novel benzene hydrogenation catalyst according to claim 2, characterized in that, In S2, the modified auxiliary metal salt solution is the carbonate or nitrate corresponding to the modified auxiliary metal; The structural aid metal salt solution is the carbonate or nitrate corresponding to the structural aid metal.

5. The method for preparing a novel benzene hydrogenation catalyst according to claim 2, characterized in that, In S3, the precipitant is sodium carbonate decahydrate; The precipitant and deionized water are mixed in a reaction vessel at a ratio of 500-600g:4000mL to form a solution.

6. The method for preparing a novel benzene hydrogenation catalyst according to claim 2, characterized in that, In step S4, the dripping time is 60 minutes; The predetermined rate is to add the solution slowly at a rate of 20-40 mL / min for the first 15 minutes, and then rapidly at a rate of 40-70 mL / min for the next 45 minutes.

7. The method for preparing a novel benzene hydrogenation catalyst according to claim 6, characterized in that, The temperature for the neutralization and precipitation reaction is 40–70°C. The aging time is 20-60 minutes, and the aging temperature is 40-70℃.

8. The method for preparing a novel benzene hydrogenation catalyst according to claim 2, characterized in that, In step S5, the calcination temperature is 350–500°C and the duration is 2–5 hours.

9. A method of using the novel benzene hydrogenation catalyst as described in claim 1, characterized in that, The catalyst is used in the hydrogenation of pure benzene or materials containing a portion of benzene.

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